Parameters: 30-** Special Features - Danfoss VLT AutomationDrive FC 301 Programming Manual

Parameter Descriptions

3.21 Parameters: 30-** Special Features

3.21.1 30-0* Wobble Function
The wobble function is primarily used for synthetic yarn
winding applications. The wobble option is installed in the
frequency converter controlling the traverse frequency
converter. The yarn moves back and forth in a diamond
pattern across the surface of the yarn package. To prevent
a build-up of yarn at the same points at the surface, this
pattern must be altered. The wobble option can
accomplish this by continuously varying the traverse
velocity in a programmable cycle. The wobble function is
created by superimposing a delta frequency around a
center frequency. To compensate for the inertia in the
system, a quick frequency jump can be included. Suitable
for elastic yarn applications, the option features a
randomized wobble ratio.
Frequency
[Hz]
Par. 30-01 [Hz]: DELTA FREQ.
Par. 30-02 [%]: DELTA FREQ.
(Par. 30-03)
Par. 30-01 [Hz]
Par. 30-02 [%]
(Par. 30-03:)
Par. 30-*1: RAMP UP
CENTER FREQ
Par. 30-10: [RATIO T
Par. 30-08: [INDEPENDENT UP and DOWN]
Illustration 3.72 Wobble Function
30-00 Wobble Mode
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
The standard speed open-loop mode in
parameter 1-00 Configuration Mode is extended
with a wobble function. In this parameter, it is
possible to select which method to be used for
the wobbler. Set the parameters as absolute
values (direct frequencies) or as relative values
(percentage of other parameter). Set the
wobble cycle time as an absolute value or as
independent up and down times. When using
an absolute cycle time, the up and down times
are configured through the wobble ratio.
[0] Abs. Freq.,
Abs. Time
*
[1] Abs. Freq.,
Up/ Down
Time
[2] Rel. Freq.,
Abs. Time
MG33MO02
Programming Guide
Par. 30-07: WOBB TIME
Par. 30-06: JUMP TIME
Par. 30-04 [Hz]: JUMP FREQ
Par. 30-09 [%] : JUMP FREQ
Par. 30-09: RANDOM FUNC
Par 30-11: RANDOM MAX
Par 30-12: RANDOM MIN
T
T
UP
DOWN
/ T ]
UP DOWN
Time [s]
Danfoss A/S © 01/2018 All rights reserved.
30-00 Wobble Mode
Option: Function:
[3] Rel. Freq.,
Up/ Down
Time
30-01 Wobble Delta Frequency [Hz]
Range: Function:
5 Hz [0 - The delta frequency determines the magnitude of
*
25 Hz] the wobble frequency. The delta frequency is
superimposed on the center frequency.
Parameter 30-01 Wobble Delta Frequency [Hz]
contains both the positive and negative delta
frequency. The setting of parameter 30-01 Wobble
Delta Frequency [Hz] must thus not exceed the
setting of the center frequency. The initial ramp-
up time from standstill until the wobble sequence
runs is determined in chapter 3.4.2 3-1* References.
30-02 Wobble Delta Frequency [%]
Range: Function:
25 % [0 - The delta frequency can also be expressed as
*
100 %] percentage of the center frequency and can
thus be maximum 100%. The function is the
same as for parameter 30-01 Wobble Delta
Frequency [Hz].
30-03 Wobble Delta Freq. Scaling Resource
Option: Function:
Select which frequency converter
input should be used to scale the
delta frequency setting.
[0] No function
*
[1] Analog Input 53
[2] Analog Input 54
[3] Frequency input 29 FC 302 only.
[4] Frequency input 33
[7] Analog Input X30/11
[8] Analog Input X30/12
[15] Analog Input X48/2
30-04 Wobble Jump Frequency [Hz]
Range: Function:
0 Hz [ 0 - The jump frequency is used to compensate for
*
20.0 Hz] the inertia in the traverse system. If a jump in
the output frequency is required at the
boundaries of the wobble sequence, the
frequency jump is set in this parameter. If the
traverse system has a very high inertia, a high
jump frequency may create a torque limit
warning or trip or an overvoltage warning or
trip. This parameter can only be changed in stop
mode.
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